Based on Western Digital 64-layer 3D NAND, the SanDisk 1TB X600 SATA 6Gb/s M.2 2280 Internal Solid State Drive delivers superior endurance. The X600 achieves this while expending up to 25 percent less power than its previous generations of SATA drives. The X600 combines Western Digital’s state-of-the-art 64-layer 3D NAND technology with Sandisk's proven solid state drive platform and it also incorporates nCache 2.0, a tiered caching technology designed to improve responsiveness for corporate and consumer workloads. nCache 2.0 uses a combination of both SLC (single level cell) and TLC flash blocks to improve endurance, increase efficiency, and boost performance.Writing data first to the SLC cache reduces write amplification on the TLC blocks.